(3x+9)+(7x+21)=180

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Solution for (3x+9)+(7x+21)=180 equation: 



(3x+9)+(7x+21)=180

We move all terms to the left:

(3x+9)+(7x+21)-(180)=0

We get rid of parentheses

3x+7x+9+21-180=0

We add all the numbers together, and all the variables

10x-150=0

We move all terms containing x to the left, all other terms to the right

10x=150

x=150/10

x=15

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